I too am long in the torso even though I'm not tall. When I was overweight, I just bought L's. Now that I'm getting smaller, I'm remembering that my torso is abnormally long and it's an issue. Tri tops are the biggest problem!

In general, I've found that Louis Garneau cycling jerseys run longer. I also have had luck with Ibex stuff, but I have not tried their cycling specific jersey, so I don't know for certain that they run long like the rest of their tops. I also have a wool jersey from Swobo that is wonderfully long. It's actually borderline too long! I got it off Steep and Cheap and I LOVE it.